Blowpipe



June 1953 MEINCKE EI'ALI BLOWPIPE Original Filed April 21, 1943INVENTORS EDWARD MEINCKE HUGH 1.5mm

ATTORNEY atented June 30, 1953 2,643,622 :ELOWRI-PE dwadMeinQke,1Summit, ,N. ;J., r and Hu Smith, 'Chicago,'--I-ll., assignorsto 'UnionGarbide and Garbon Corporation, a corporation of New York .Qriginal application April 21, ,1 943,,.seria1 No. 483,874. IDivi'dedandthis applieationEebruary "This inventionrelates to blowpipeapparatus forthermochemically removing metal bya stream or jet of oxygen from metalbodies having a composition which resists the normal thermochemicalaction of a stream or jet of -oxygen,-such-resistance bein.suiiicient-tohinder-or substantially prevent such normalremoval=of-metal. Examples of such metal bodies are ferrous'metals, suchas stainless steels-cast iron, and the like,-and nonferrous metals, suchas--copper, aluminum,nickel and various'a'lloys. Such'metal bodiesaredimcult or impossible to cut, deseam, desurfaee or the like by thenormal impingement of a 'st'ream of oxygen upon successive portionsheated to their ignition temperature. However, they ean -now be cut,deseamed;and'desurfaced thermochemically by blowing into the reactionzone along with the oxygen jet a stream of powdered oxidizableadjuvantmaterial, such as powdered iron.

Among the objects of the-present invention are to provide blowpipeapparatus having means for rapidly starting and stopping the flow offinelydivided adjuvant powder .to .atherniodhemical reaction zone; toprovide blowpipe-apparatus having means for automatically. starting andstopping the flow of oxygen andpowdered material in a predeterminedsequential relation to one another; and to provide otherieatureswhichwill'be. apparent as'the following description proceeds.

Apparatus -constructed=in aecoi'danoe with this invention is illustrated"the accompanying drawings, in which Fig. 1 is a side elevational View,partly broken away and in section, of a blowtorch embodying theinvention;

Fig. 2 is an enlarged longitudinal sectional view of the head end of theblowtorch shown in Fig. l; and

Fig. 3 is a cross-sectional view taken along the line 3'3 of Fig. 2.

In the embodiment of this invention illustrated in Figs. 1, 2, and 3, anozzle II is secured in a head I3 by an annular nut [5, in a well-knownmanner. The nozzle II has annularly arranged longitudinal preheatpassages H for a combustible preheating medium, and a centrallongitudinal oxygen passage I 9. Near the rear end of the nozzle H aseries of ports 23 for powder are drilled transversely through the wallof the nozzle and the liner 2| to the oxygen passage IS. The ports 23are located between the preheat passages H, as shown clearly in Fig. 3,and are inclined forwardly toward the axis of the nozzle. An oxygendischarge tube 25, which has an annular flange adjacent to its rear endfitting snugly in the rear end of-thepassage 19, is carried-bythe nozzleII and extends forwardly inspaced relanon-to the wall-of thepassage 19to a point well ahead of the ducts 23 andspaced from the outlet of thepassage 1-9. The-front portion of the tube 25 carries a plurality oflaterally extending fins 22] fitting snugly "in'the passage t9 andbreaking down into a plurality of small ducts the annular space-aroundthe tube.

' A"C OI11buStib1e preheating-medium,such. as an oxyacetylene mixture,may be distributed to the passages 1;! 1 by -'an.-annular distributingchamber '3! supplied by ae' nduit-sa s ecured"inia connecting bor efilrinthe-head -l 3.

jFinely-divided adjuvant mater'i'al may be. sup-- plied to the ports23;. and thence to the .annular -s'pace 29,' by a-tube 31 secured inaconnecting bore 39 leading into an annular chamber .4 I surrounding-arear portionof the nozzle I:I ,A' suitable source of powder, as shown in:Fig. '1, may comprise a closed -ho'p per tfi connected to .theblowpipeby-a'fiexible hose 42, andhaving an inlet pipe Ml throughWhichgasunder pressuremay enter above the powder level.

Oxygenenters the d-ischargetube'25 through a conduit it-secured inabore. 45 in head 'l3, andis-then' discharged'into the relatively largepassage; IB aSp'irating into the passage a plurality of small streams#of powder flowing smoothly in substantially a straight line from theannular space 29. "The-powderan'd oxygen mix intimately -together:-while-passmg=-along the passage I 9,. and may be 'd-ischargedag'ain's't abodyof metal pre- -heatedtby the flames from-the passages ii, therebyremoving metal from the body thermochemically.

Adequate gas-tight seals preventing the passage of gas into or out ofthe annular chamber 31 are provided by two annular conical seats 46 and48 on the rear end of the nozzle l I, which seat tightly oncorresponding seating surfaces in the body I 3.

It is desirable that powder from the passage 39 be controlled so as toenter the nozzle 1 I only when metal-removing oxygen is flowing throughthe tube 25. This is accomplished by placing a suitable shut-off valve41 in the bore 39 of the head [3. The valve 47 illustrated, by way ofexample only, is an ordinary rotatable plug valve secured in a crossbore 49 of the head I3 and having a through passage 5| which may berotated into and out of register with the bore 39. The valve d1 includesa stem 53' projecting from the side of the body It; and engaging a crank55 to which an operating rod or wire 5? is attached by a set screw. Withthis arrangement, the operator of the blowpipe can start or stop theflow of powder to the nozzle II by manipulating the wire 57.

In Fig. 1 there is shown an arrangement whereby the operator may controlin unison the flows of powder and metal-removing oxygen to the nozzle H.The blowpipe handle 59 has the usual long lever Bl; fulcrumed betweenits ends, and engaging at its rear end the stem 63 of a spring-closedvalve controlling the flow of metalremoving oxygen to the nozzle I l.The lever 61 is connected through a suitable linkage 65 to theconnecting rod 57, the construction and arrangement being such that whenthe operator actuates the lever 61 to start or stop the fiow of oxygen,the powder control valve 41 is rotated to start or stop the flow ofpowder. The linkage may be such that the fiows of oxygen and powderstart and stop simultaneously, or any other predetermined sequentialrelation may be maintained.

The particular linkage 65 shown in Fig. 1, by way of illustration only,comprises a rotatable element 67 pivoted at 69 to a stationary support Hwithin the handle 59. An L-shaped connecting link 13 is pivotallysecured at one end to the element 67 on one side of the pivot 69, and atits other end to the valve-operating lever 6|, whereby movement of thelever 6| causes the element 61 to turn through part of a revolution. Aturn-buckle 15 is pivotally secured at one end to the element 67 on theopposite side of the pivot 59, and at its other end grips the connectingrod or wire 51, whereby rotation of the element 67 opens or closes thevalve 47. A return spring 77 is secured at one end to the handle 59, andat its other end engages the pivoted element 6'1, for assisting thereturn of the lever 6| to its raised position when released by theoperator, thereby closing the oxygen control valve 63 and the powdercontrol valve 47. r

This application is. adivision of our application Serial No. 483,874,filed April 21, 1943, Patent No. 2,444,900 granted July 6, 1948.

What is claimed is:

1. In a. blowpipe having a handle, a head havoperating said first valve;reciprocable valve actuating means extending from said handle to saidsecond valve; and means linking said lever to said reciprocable meanswhereby movement of said lever results in movement of said second valve.

2. A manually operable o-xy-acetylene powder scarfing blowpipecomprising the combination with an oxy-acetylene deseaming torchincluding a tubular handle through which extend elongated conduits forconducting cutting oxygen and conducting a combustible gas mixture ofoxygen and acetylene, manually operable lever means mounted on saidhandle for controlling the cutting oxygen delivered to the cuttingoxygen conduit, a head connected to said conduits,

and a nozzle connected to said head, said head I arate powder supplyline extending through said handle and connected to said head, saidnozzle having lateral ducts for conducting powder to the interior of thenozzle, and said head having an annular chamber communicating with suchducts, said head also having a powder passage connecting said powdersupply line to said annular chamber, a powder valve mounted on said headfor controlling the fiow of powder supplied through said passage, andpowder valve operating means comprising a flexible connecting rodoperatively associated with said valve and said lever means, and springmeans within said handle acting through said fiexibie connecting rod toclose said valve.

EDWARD MEINCKE.

HUGH T. SMITH.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,178,551 Stolle et a1 Apr. 11, 1916 1,237,535 Martin Aug. 21,1917 1,266,858 Reyburn May 21, 1918 1,412,656 Jenkins Apr. 11, 19222,221,825 Van Triest Nov. 19, 1940 2,283,932 Jones May 26, 19422,817,936 Nicholson et a1 Apr. 27, 1943 FOREIGN PATENTS Number CountryDate 18,234 Great Britain Aug. 2, 1916

